Dynamo-electric machine



March 19, 1929. w. E. RICHARD ET Ax.

I DYNAMO ELECTRIC MACHINE Filed Aug. 24, 1,927

nr in) Patented Mar. 19, 192%.

wrmn'mwr nnwean messen man anni FJ' EVANSVILLE, IN-

MANUFACTURING COIEANY. GF

Application filed august 'z2/5l, i927.

Our invention relates to dynamo-electric machines and has particularrelation to dcvices for mounting brushes in dynamo-electricy machines oithe commutator type.

In the past it has been customary to utilize members o'f insulatingmaterial for supporting the brushes oi dynamo-electric machines ol thetype referred to. ln machines utilising a plurality of pairs ofinterconnected brushes, electrical vcircuit connections have been madebetween brushes of like polarity by means oi conductors extendingloosely around the commutator externally oi the brush-supporting` memberand connected to the holders of brushes of like polarity by means ofbinding posts or terminal screws. Such conductors are frequently brokenor damaged by reason of their exposed condition, thereby causing failureof operation oi the machine and, in some cases, causing ing' ury to themachine.

The object of our invention is to provide a mounting device fordynamo-electric machine brushes wherein electrical circuit connection isestablished between brushes of like polarity without utilizing externalconductors.

Our invention will be better understood by referringto the followingdetailed description in connection with the accompanying; drawings, inwhich:

Figure l is a iront elevational view oif a bruslrsupporting` deviceembodying our invention; n

Fig. 2 is a vertical sectional view of the device shown in Fig. 17 takenalong the lino ll-II oi said figure; and

Fig. 3 is a perspective view showing the device embodying' our inventionwith a plurality of brushes operatively mounted thereon.

Referring` to the drawings, a substantiallyv fiat annular member l() ofmolded insuletinp` material is provided with a centrally disposedaperture ll, through which the coniniuta'tor of the machine with whichthe device is to be associated is adapted to extend. A plurality orapertures l2 are provided to receive bolts or screws for securing themember l0 in proper operative position within the machine.

Metallic inserts 18 to 20, inclusive, are molded in position within themember l0 and provide support for brush holders 21, 22, 23 and 24, whichmay be of conventional design.

' l() by means gage internally .L

E A tnV brush and 1C the brush i .i y] homer.

8 ami the brush and 20.

ino mush liold 2li. and 937 beino oi like polaiiy, must bY Ve ectricallyconnected and 22 and also b ing1 oi? like These i likewise connected.

'effected by means of conductors ar that are embedded v. the moldedmember i0. The conductor 2G is connected one end thereof to the insertlil and at the other end thereof to the insert i8, upon which insertsthe brush holders 2l and 23, respectively are mounted. rllhe conductor2i connects the' inserts l5 and 20, which support the brush holders 22and 24s, respectively, ln order to insure perfect insulation oi" theconductors 26 and 17 with respect to each other and with respect toother parts of the three 28, 29 and 30 oi insuo iabric are also embeddedwithin the d member l0. The middle layer 29 t ed between the twoconductors 2G and Ae outer layers 2S and 30 are disposed between thecond ctors 2G and 27, respective` ly, and the adjacent outer surfaceso'i thc member lfb VEhe provision o'lE the tabric lay- 28./ and 3() alsoincreases the mechanstrength oit' the member iti, u

' s nal advantage in in (i iction. It will be seen t iat the utilizationot my inif'ention permits the elimination of all ex ternal connectingwires between brushes o' like polarity in a dynamo-electric machine,which not only renders the machine less subject to failure or dams-ge9but also facilitates assembly and maintenance oi the machine and reducesthe number of parts utilized in the construction thereof.

"While we have shown our invention as applied to a dynamo-electricmachine utilizing only two brushes in each set, it will be apparent tothose skilled in the art that the invention is equally adaptable tomachines wherein cach set oi brushes comprises a greater number oi'individual brushes. It will also be seen that various other modiicationsand chances may be mede in the particular snif bodimeut ot our inventionherein illustrated and described, .vithout departing from the spiritandscope of our invention, as set forth in the appended claims.

le claim as our invention:

l. A device for mounting a plurality oit sets of brushes for adynamo-electric machine comprising an annular member' ot moldedinsulating,` material including inse of conducting material,ln'usl'i-holders secured to said annular member in electricalconducting` relation to said inserts, conductors 'for establishingelectric circuit connection between certain of said inserts and a layerot insulating tabric between said conductors.

2. A, device for mounting a plurality ot sets ot' brushes i'or adyi'iamo-electric machine comprising' a molded insulating;l mem* ber oi'substantially tlat annular 'form including a plurality oit internallyscrew-threaded metallic inserts, brush-holders secured to sa'dinsulating member in electrical conducting' relation to said inserts, aplurality7 of conductors embedded in said molded member for establishingelectrical circuit coiv nection between certain of said inserts, and aplurality of substantially flat spaced layers ol insulatiwi ii; i f mgfabric uisposed witmn said molded nieu ber for sepa ating saidconductors one from another and 'from the flat surfaces el. said moldedmember.

3. A device for mountingl two pairs ot brushes ior a dynamo-electricmachine comw prising a molded insulating member ol substantially flatannular iiorm including a plurality of internally :crew-threadedmetallic inserts, holders 'tor the brushes severally secured to saidinsulating` member through the medium ot said insert-s and in electricalconducting relation to the latter, two conductors embedded in saidmolded member tor citablishingelectrical circuit connection between theinserts 'for supportare, the two brushes ot each pair and threesustautially Het layers oi insulatingl fabric embedded in said moldedmember, the middle one ot said layers being; disposed between said twoconductors and the other two olf said layers beingrespectirtl),vdisposed between one of said conductors and the adjacent outer surfaceot said molded member.

In witness whereof, we have hereunto subscribed our names.

VILLIAM EDWARD RICHARD. JOHN HENRY SCHROEDER.

